Bolt-end spinning tool



Naw', 1932. 1 M. BUTLER BOLT END SPINNING TOOL Filed sept. 9, 1951 l 2sheets-snee: i

.annual VII Nov' la L. M. BUTLER BOLT END SPINNING TOOL Fild Sept. 9,1931 2 Sheets-Sheet `2 ...QF 1 -1 TT@ En I. 2 l 2 lllg l// l vil H m M iy l5 (ci {3f/6 l 35 5 5 L m M 'V /7' 1 y v ,ini-ew? M a gmc/nto@Patented Nov. l, 1932 UNITED STATES) .LEO M. BTLER, OF SEATTLE,WASHINGTON, ASSIGNOR TO BOEING AIRPLAN E COMPANY,

TENT OFFICE OF SEATTLE, WASHINGTON, A CORPORATION OF WASHINGTON'BOLT-END SPINNING TOOL Application filed September 9, 1931. Serial No.561,864.

threaded thereon. Itis particularly intended for use in airplanestructural work. This application is a continuation in part of myapplication Serial No. 365,103, filed May 22,

Such an action is essential to the use of bolts in airplane structuresto prevent the loosening or loss of nuts, due to vibration of theframework, and it has been common praci tice in connection with some ofthe bolted structural members, to enlarge the end of the bolt, after thenut has been applied, by the use of a chisel or the like, which splitsthe end of the bolt, thereby enlarging it to preivent the nut fromloosening. This practicer is objectionable, however, since the work isnot always perfectly done, and the striking of a blow has a tendencyto-bend or displace the lightweight structural members, but especiallyit cannot tend to tighten the bolt in the nut, nor can it insure thatthe two are as tight v as they can be drawn.

The principal object of my invention, then, is to provide a tool of thischaracter,

3Q which is of simple, efhcient, durableland inexpensive construction,whereby the enlarging of a bolt end is greatly facilitated, saving timeto the operator, and enabling the operationto be performed without thepossibility of damage to the structural elements theme selves, andautomatically insuring perfect results.

Itis also an object so to arrange such a tool that any tendency of thebolt to turn, due to the spinning action of the tool, will tend totighten the nut upon the bolt, thereby insuring that the nut, whenfinally held by the spun down head, will be tightened to its maximum,and that it will not be loosened by the spinning operation, nor becapable of becomingloose later on.

These and other objects will appear as ymy invention is more fullyhereinafter described in the following specification, illustrated in theaccompanying drawings (in forms which illustrate the principles of myinvention) and finally pointed out in the appended claims.

Figure l is a side elevationk of my tool, as a lvovlole, about to beengaged with ay nut and Figure 2 is a view in axial alignment with abolt, the end of which has been spun down upon the nut threaded thereon.

Figure 3 is a det-ail elevation, with parts in section, showing thepreferred formV of such a tool.

Figure 4 is a part section and part elevation of such a tool, taken atright angles to Figure 3.

Figure 5 is an end elevation of the tool shown in Figure 3.

Figure 6 is a view similar to Figure 3 showing a modified form of tool,and Figure 7 is an end view thereof similar to Figure 5.

Figure 8 is a view similar to Figure 3 of a further modified tool, andFigure 9 is an end elevation thereof similar to Figure 5.

Conveniently such a tool may be driven by an electric motor, the casingof which is indicated at 9.

Such a motor is supported upon a slide 90, having a handle 91, and theoperation of the tool is controlled by a switch, the handle 92 of whichis supported upon or in proximity to the handle 91. Associated with thetool is an anvil member 8 carriedy upon kthe bent arm 80 of a slide 81,which is complemental to the slide 90. To move the two slides relativeto one another, any convenient means may be employed, and I have hereinshown the slide 8l as provided with ratchet teeth 82 engageable by aratchet pinion (not shown) controlled by a shaft 93 journaled in theslide 90, and operated by a handle 94. By these, or equivalent means,the anvil member 8 may be drawn with the required degree of force towardthe motor 9 and the spinning tool l supported therebelow. This spinningtool, which may take several forms, is supported in a chuck 2, whichreceives the shank 10 of the tool, and which is rotatable i by the motor9. Y

The preferred form of the tool is illustrated best in Figure 8. The toolin this form consists of a shaft 1l having a groove 12 (see Figure 4) inits end, within which groove is received the tool proper consisting ofthe blade 1. The end of this blade is formed to s in down the end of abolt, rivet, or the 5 l1 e,- with which it is brought into contact whilerotatin and this form, as illustrated, includes notV es 3 at oppositesides of the center of the tool, each notch having a groove 14 leadingaway from it in the surfaces of the blade, but at opposite sidesthereof. The shank 10 of such a'tool, which in effect is the uiper endof the shaft 11, is received in the c uck 2, as has been pointed out.This shank may be threaded, as indicated at 15, l5 and lock nuts 16threaded upon this shank, in cooperation with a sleeve 3, journaled uponthe shaft portion 11 of the tool, serve to limit movement of the tool,as will be brought outy hereafter.' A limit collar 17 may also beapplied to the outer end of the tool, this being heldin place by a setscrew 18, and this serves to prevent separation of the sleeve from thetool shaft.

The sleeve 3 is journaled at one end upon the shaft of the tool, as hasbeen brought out, and at its other end is socketed, as indicated at 3G,to fit closely about a nut 40 upon the end ofthe bolt 4, which is to bespun down. Engagement of the socket with this nut holds l the entiretool in proper axial alignment with the bolt. So en aged, the workmancan give his attention so ely to the spinning operatibn, xwithoutthought to the proper holding of the tool. Because the position of thelimity 85 nuts16 determines the amount of movement ofthe spinning toolrelative to the work, he can the tool to the work until it will go nekarther, whereupon he knows that the Spinnin has been properly done, andthat 40 the hea 42 yis perfectly formed. This enables'rapidaccomplishment of the work, and insures perfect results.

Such sleeves may be changed, to make the tool 4readyfor employment withdifferently 4e' sized nuts, by removing the collar 17. The

blade, kwhen worn down, can be similarly removed or reforming, and canbe replaced by a substitute blade.

The direction of rotation of the tool 1 is such that its tendency toturn the bolt 4 will cause the bolt to be tightened in the nut. Th'ennutis frictionally held to the work, as indicated at 41, and is furtherheld against rotation by the 'engagement therewith of the $5 socket 30,and the engagement of the latter withthe work. The sleeve 3 is journaiedon the shaft 11 so freely that the tendency to rotate the nut, caused byrotation of the shaft 11 and tool 1, is slight. An oil hole is indi- 00cated inthe sleeve at 33 so that this journal bearing can be kept free.

-In Figures 6 and 7 a slightly modified r.'il'rn of tool has been shown.The tool 1 iS formed by grinding away the lower end of the shaft 11itself. The limit maar 17 In Figures 8 and 9 a further modification isshown. The tool in this instance departs from the blade form heretoforedescribed, and comprises two rollers 5 and 50 journaled upon a.transverse pin 51, received in a yoke 52 upon the end of the shaft 11.In this form also the shaft 11 is provided with a groove 19, withinwhich is received a spring ring 6, against which one member 61 of athrust bearing reacts, the other member 62 of this thrust bearing beingthe backing means against which a compression spring 63 bears. Thisspring 63 is interposed between the thrust bearing described and abushing 36 received within the sleeve 8. This bushing also servesthesame function as the collar 17 in the other forms, to limit relativemovement between the tool 5, 50 and the sleeve 3.

By the use of a spring, the sleeve 3 and its socket 30 are yieldinglyurged against the work, due to pressure, tending to cause axial movementof the tool itself. Such a spring means may be employed in connec tionwith the other forms of the tool, if desired.

It is believed that the operation of the tool will be evident, and itshould be borne in mind that the direction of rotation is such as totend to cause tightening of the bolt with respect to its nut, so thatthere will never be any tendency to loosen the nut on the bolt.kConsequently the bolt will always be held as tightly as possible.

What I claim as' my invention is z 1. A device for spinning the end of abolt down, u on a nut threaded thereon, comprisingba s eeve socketed atone end to closely em race the nut, a spinning tool, a tool supporttherefor, means for rotating the same,

this form is replaced by the through pin the sleeve being rotativelysupported from the tool support means to move the tool and its supportaxially relative to the sleeve, and anvil means applied to the head ofthe bolt cooperating with the tool support to resist the axial thrust ofthe tool.

2. A device for spinning the end of a bolt down upon a nut threadedthereon, comprising a sleeve socketed at one end to closely embrace thenut, a spinning tool, a tool support therefor, means for rotating thesame, the sleeve being rotatively supported from the tool support, meansto move the tool and its support axially relative to the sleeve, andmeans yieldingly urging the sleeve axially inthe same direction as thetool.

3. A device for spinning the end of a bolt down upon a nut threadedthereon, comprising a sleeve socketed at one end to closely embrace thenut, a spinning tool, a tool support therefor, means for rotating thesame, the sleeve being rotatively supported from the tool support, meansto move the tool and its support axially relative to the sleeve, the

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tool having a thrust bearing associated therewith, and a compressionspring interposed between said bearing and the sleeve to yieldingly urgethe latter axially in the same direction as the tool.

4. A device for spinning the end of a bolt down upon a nut threadedthereon, comprising a fiat tool having its end shaped to spin down thebolt end, a rotary and axially movable tool support, a sleeve journaledat one end upon the tool and slidable axially therealong, and at itsother end formed to closely embrace the nut upon the bolt, and means torotate the tool and its support in a direction 'tending to tighten thenut upon the bolt.

5. A tool of the class described consisting of a shaft mounted forrotary motion within a sleeve, a spinning tool upon the end of saidshaft and adapted for spinning engagement with a bolt end, said sleeveextending beyond said spinning tool and formed into a nut-receivingsocket for engagement with a nut on the bolt being dealt with, so thatany tendency of the bolt to turn will cause a tightening of the nut, andanvil means applied to the head of the bolt cooperating with thespinning tool to resist the axial thrust ot the tool.

6. A rotary tool for spinning bolt ends and the like, comprising a shaftslotted transversely at its end, and a blade removably received in saidslot to positively rotate with said shaft, the end of said blade beingformed to spin down a bolt end to which it is applied.

7. A rotary tool for spinning bolt ends and the like, comprising a.shaft, a blade received in the end of said shaft, the end of said bladebeing notched at opposite sides of its center, and one surface of theblade being plane except as it has a groove extending inward from one ofsaid notches, the opposite surface being plane except aspit has a likegroove extending inward from the opposite notch.

8. A bolt-end spinning device comprising a rotary tool, a sleevejournaled by one end upon the shank of said tool, and axially slidablethereon, and its other end extending therebeyond to contact with thework, and limit stops secured upon the tool shank, and engageable withthe end of the sleeve to limit movement of the tool towards the work.

9. A bolt-end spinning device comprising a rotary tool, a sleevejournaled by one end upon the shank of said tool, and axially slidablethereon, and its other end extending therebeyond to contact with thework, and limit stops adj ustably threaded upon the tool shank, andengageable with the end of the sleeve to limit movement of the tooltowards the work.

10. A bolt-end spinning device comprising a rotary tool, a sleevejournaled by one end upon the shank of said tool, and axially slidablethereon, and its other end extending therebeyond to closely embrace thenut upon

